A method for correcting wifi chip phase offset
A phase offset and chip technology, applied in the field of signal processing, can solve the problems of spending a lot of time, unable to provide fast and reliable phase offset correction, limited accuracy of correction, etc., to achieve the effect of reducing labor and time overhead
Active Publication Date: 2021-04-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
Since the WiFi chip did not consider the need for array signal processing at the beginning of its design, there will be phase shifts in the channel state information measured between different receiving antennas; and array signal processing requires precise synchronization of the phases between antennas, so that Makes the raw measurement of channel state information unusable directly
In order to solve this problem, researchers have proposed a variety of methods to correct the phase offset; however, the existing methods either require a lot of time to complete the cumbersome correction steps, or the accuracy of the correction is limited, and cannot provide fast Reliable phase offset correction, so that the WiFi-based array signal processing system cannot be deployed in the actual environment
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[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0021] This embodiment provides a WiFi chip phase offset correction method. The WiFi chip used in this embodiment is Intel 5300. The chip has three radio frequency channels. One channel is set as the reference channel, and the remaining two channels are channels to be corrected. ;Set the center frequency of the signal to 5.31GHz, and the bandwidth to 40MHz; first, perform steps 1 to 6 to obtain all possible values of the phase offset of the chip as shown in the following table:
[0022] Channel 1 to be corrected Channel 2 to be corrected probably worth one -2.3332 radians -0.1824 radians probably worth two 0.7448 radians 2.8323 radians
[0023] As can be seen from the table above, there are two possible values for the phase offset for each channel; then proceed to steps 7 to 9.
[0024] Transmit a signa...
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The invention belongs to the field of signal processing, and specifically relates to a phase offset correction method of a WiFi chip. The invention removes the phase offset introduced by the wire by exchanging the wire connected to the receiver; For measurement, a table of all possible phase offset values is established; a transmitter with a known angle of arrival is used to transmit signals and estimate the angle of arrival, and a phase offset value that can give a correct angle of arrival estimate is searched for as an estimated value. Using the correction method of the present invention, the accurate correction of the phase offset between the antennas in the WiFi chip can be quickly realized, thereby reducing the manpower and time expenditure in the actual arrangement of the WiFi-based array signal processing system.
Description
technical field [0001] The invention belongs to the field of signal processing, and in particular relates to a phase offset correction method of a WiFi chip. Background technique [0002] The related technologies that use antenna arrays to receive signals and analyze and process them are collectively called array signal processing. As an important part of modern signal processing, it is widely used in radar, sonar, imaging and other fields. As a wireless local area network technology, WiFi has penetrated into thousands of households; in addition to basic communication functions, whether WiFi can provide more functions such as indoor positioning, human body detection and tracking has become a research hotspot in recent years. The channel state information provides the possibility for the realization of these functions. [0003] In order to increase the communication rate, WiFi chips are often equipped with multiple antennas; inspired by this, researchers have applied array s...
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IPC IPC(8): H04B17/12H04B17/21
CPCH04B17/12H04B17/21
Inventor 陈彦张东恒胡洋曾兵
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA